public void RenderSpotShadow(int index, int splitCount, int tileSize)
{
OtherShadow otherShadow = otherShadows[index];
ShadowDrawingSettings shadowDrawingSettings = new ShadowDrawingSettings(cullingResults, otherShadow.VisibleLightIndex);
cullingResults.ComputeSpotShadowMatricesAndCullingPrimitives(otherShadow.VisibleLightIndex,
out Matrix4x4 viewMatrix, out Matrix4x4 projectionMatrix, out ShadowSplitData shadowSplitData);
shadowDrawingSettings.splitData = shadowSplitData;
SetShadowMapViewport(index, splitCount, tileSize, out Vector2 offset);
float inversedSplitCount = 1f / splitCount;
// !!
// ??
float texelSize = 2f / (tileSize * projectionMatrix.m00);
float filterSize = texelSize * ((float)shadowSettings.OtherShadowSettings.PCFMode + 1f);
float bias = otherShadow.NoramlBias * filterSize * 1.4142136f;
SetOtherTileData(index, offset, inversedSplitCount, bias);
otherShadowMatrices[index] = ConvertClipSpaceToTileSpace(projectionMatrix * viewMatrix, offset, inversedSplitCount);
commandBuffer.SetViewProjectionMatrices(viewMatrix, projectionMatrix);
commandBuffer.SetGlobalDepthBias(0f, otherShadow.SlopeScaleBias);
ExecuteBuffer();
renderContext.DrawShadows(ref shadowDrawingSettings);
commandBuffer.SetGlobalDepthBias(0f, 0f);
}
public Vector4 ReserveOtherShadows(Light light, int visibleLightIndex)
{
if (light.shadows == LightShadows.None || light.shadowStrength <= 0)
{
return(new Vector4(0f, 0f, 0f, -1f));
}
int occlusionMaskChannel = -1;
LightBakingOutput lightBakingOutput = light.bakingOutput;
if (lightBakingOutput.lightmapBakeType == LightmapBakeType.Mixed && lightBakingOutput.mixedLightingMode == MixedLightingMode.Shadowmask)
{
useShadowMask = true;
occlusionMaskChannel = lightBakingOutput.occlusionMaskChannel;
}
bool isPoint = light.type == LightType.Point;
int newLightCount = currentOtherShadowCount + (isPoint ? 6 : 1);
if (newLightCount >= maxOtherShadaowCount || !cullingResults.GetShadowCasterBounds(visibleLightIndex, out Bounds bounds))
{
// the shadow strength of light is negative, see GetDirectionalShadowAttenuation in WindsmoonShadow.hlsl
// if the stength is positive, the shader may be handle the shadow as realtime shadow
return(new Vector4(-light.shadowStrength, 0f, 0f, occlusionMaskChannel));
}
otherShadows[currentOtherShadowCount] = new OtherShadow()
{
VisibleLightIndex = visibleLightIndex,
SlopeScaleBias = light.shadowBias,
NoramlBias = light.shadowNormalBias,
IsPoint = isPoint
};
Vector4 data = new Vector4(light.shadowStrength, currentOtherShadowCount, isPoint ? 1f : 0f, occlusionMaskChannel);
currentOtherShadowCount = newLightCount;
return(data);
}
public void RenderPointShadow(int index, int splitCount, int tileSize)
{
OtherShadow otherShadow = otherShadows[index];
ShadowDrawingSettings shadowDrawingSettings = new ShadowDrawingSettings(cullingResults, otherShadow.VisibleLightIndex);
// !!
// ??
float texelSize = 2f / tileSize;
float filterSize = texelSize * ((float)shadowSettings.OtherShadowSettings.PCFMode + 1f);
float bias = otherShadow.NoramlBias * filterSize * 1.4142136f;
float inversedSplitCount = 1f / splitCount;
float fovBias = Mathf.Atan(1f + bias + filterSize) * Mathf.Rad2Deg * 2f - 90f;
for (int i = 0; i < 6; ++i)
{
cullingResults.ComputePointShadowMatricesAndCullingPrimitives(otherShadow.VisibleLightIndex, (CubemapFace)i, fovBias,
out Matrix4x4 viewMatrix, out Matrix4x4 projectionMatrix, out ShadowSplitData shadowSplitData);
// ??
viewMatrix.m11 = -viewMatrix.m11;
viewMatrix.m12 = -viewMatrix.m12;
viewMatrix.m13 = -viewMatrix.m13;
shadowDrawingSettings.splitData = shadowSplitData;
int tileIndex = index + i;
SetShadowMapViewport(tileIndex, splitCount, tileSize, out Vector2 offset);
SetOtherTileData(tileIndex, offset, inversedSplitCount, bias);
otherShadowMatrices[tileIndex] = ConvertClipSpaceToTileSpace(projectionMatrix * viewMatrix, offset, inversedSplitCount);
commandBuffer.SetViewProjectionMatrices(viewMatrix, projectionMatrix);
commandBuffer.SetGlobalDepthBias(0f, otherShadow.SlopeScaleBias);
ExecuteBuffer();
renderContext.DrawShadows(ref shadowDrawingSettings);
commandBuffer.SetGlobalDepthBias(0f, 0f);
}
}
